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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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P-N junction01:11

P-N junction

1.6K
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
1.6K
Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

2.4K
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Layer Engineering of 2D Semiconductor Junctions.

Yongmin He1,2, Ali Sobhani3, Sidong Lei1

  • 1Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 3, 2016
PubMed
Summary
This summary is machine-generated.

Researchers fabricated novel junctions in 2D materials by exploiting thickness variations. These unique structures mimic p-n junctions, showing rectification and photovoltaic effects in molybdenum diselenide (MoSe2).

Keywords:
2D semiconductor junctionslayer engineeringmultilayer MoSe2photovoltaic effectsrectification effects

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials offer unique electronic properties due to their atomic thinness.
  • Fabricating functional junctions in 2D materials is crucial for next-generation electronic devices.
  • Conventional junction fabrication methods face limitations in ultra-thin layered systems.

Purpose of the Study:

  • To demonstrate a new concept for fabricating junctions in 2D materials based on thickness dependence.
  • To explore the feasibility of creating p-n junction-like behavior in chemically homogeneous 2D materials.
  • To investigate the electronic and optoelectronic properties of thickness-engineered junctions.

Main Methods:

  • Fabrication of junctions by connecting regions with varying layer thicknesses in 2D materials.
  • Utilizing thickness dependence as the primary mechanism for junction formation.
  • Characterization of rectification and photovoltaic effects in molybdenum diselenide (MoSe2) junctions.

Main Results:

  • Successful demonstration of a novel junction fabrication concept in super-thin-layered 2D materials.
  • Observation of junction characteristics analogous to traditional p-n junctions.
  • Experimental evidence of rectification and photovoltaic effects in chemically homogeneous MoSe2 junctions with varying thicknesses.

Conclusions:

  • Thickness-dependent junction fabrication is a viable strategy for 2D materials.
  • Chemically homogeneous 2D materials can exhibit p-n junction-like behavior through thickness engineering.
  • This approach opens new avenues for designing advanced electronic and optoelectronic devices based on 2D materials.